X-ray tube.



N0.77'7.50s. PATENTED DEC. 13, 1904.

R. FRIEDLANDER.

X-RAY TUBE.

APPLICATION FILED SEPT. 12. 1904.

N0 MODEL Unnirn STATES- Patented December 13, 1904.

rricn,

X-RAY TUBE.

SPECIFICATION formingpart of Letters Patent No. 777,503, dated December13, 1904. Application filed September 12, 1904. Serial Nb. 224,073. (Nomodel.)

To all whom it may concern:

Be itknown that 1, ROBERT FRIEDLANDER, a citizen of the United States of'America, and a resident of Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in X-RayTubes, of which the following is a specification.

This invention relates to that type of vacuum or. X-ray tubes in whichprovision is made for regulating the degree of vacuum existing withinthe tube, and more especially to that form of such tubes which forms thesubject-matter of Letters Patent No. 725,331, issued April 14:, 1903,to'Theodor Friedlander; and the present improvement has for its objectto provide asimple and efficient structural arrangement and combinationof parts whereby the degree of attenuation within the raytube can beincreased or diminished as required and as will hereinafter more fullyappear.

are arranged as shown or in any other usual and suitable manner.

5 is a tubular neck or chamber connecting with the ray-tube proper, soas to be in communication with the interior of the ray-tube.

6 is a head or terminal arranged in the interior of the neck or chamber5 and provided with the usual connecting-eye 7 of the exterior of theneck 5 for convenient connection with the line wire or wires of theinductorium. In the present invention the head or terminal 6 constitutesthe means for efiiecting an increase or a decrease, as required, inthe-degree of attenuation of the atmosphere within the ray-tube, and tosuch end has a compound construction, as follows:

8 is tubular casing or shell forming a portion of the head or terminal 6aforesaid, and formed of platinum or other equivalent material, whichunder the influence of an elecposed of potassic hydrate or other likesub-' stance, which under the influence of an electrical dischargefromthe negative pole of the inductorium is adapted to give'ofi in a gradualmanner a volume of gas to the gaseous atmosphere of the ray-tube toeffect a'gradual decrease in the degree of attenuation of the same.

10 is a passage in the side of the tubular casing or shell 8, throughwhich the gas generated from the filling 9 passes into the interior ofthe ray-tube.

Various ordinary modifications can be made in the relativearrangementand formation of the par-ts constituting the terminal or head6 without departing from the scope of the present invention so long asthe essential feature ofthe invention ismaintained, and which consists,broadly, in having the parts 8 and 9 connected in common to a singleexternal connecting-eye or its equivalent and adapted for connectionwith-one orthe other of the poles of an inductorium or other source ofhigh-fre-' quency electric current.

I The present invention affords a very simple, durable,vand efficientarrangement'of parts, wherein asingle connecting-eye 7 is capable ofenergizing either of the aforesaid increasing and reducing agencies 8and 9 to either increase or reduce the degree of alteration of theatmosphere of the ray-tube, the only requirement beinga change in theconnection from the positive to the negative current, or vice versa, ofthe inductorium to the aforesaid eye 7 or a complete disconnection ofthe inductorium from such connecting-eye when the requireddegree ofattenuation is attained.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is

l. A ray-tube, and a compound terminal arranged therein-and comprising agas-absorbing and a1 gas-evolving element, substantially as set ort 2. Aray-tube, and a compound terminal arranged therein anol comprising ashell of gasabsorbing material and a mass of gas-evolving materialinclosed in said shell, substantially as set forth.

3. A raytube, a compound terminal arranged therein and comprising agas-absorbing and a gas-evolving element, and an ex ternalelectricalconnecting means common to both of said elements,substantially as setforth.

4. A ray-tube, a compound terminal arranged therein and comprising ashell of gasabsorbing material and a mass of gas-evolving materialinclosed in said shell, and an external electrical connecting meanscommon to both of said gas-absorbing and gas-producing materials,substantially as set forth. I

5. The combination of a ray-tube having anode and cathode terminals, anda compound terminal arranged therein and comprising a gas-absorbing anda gas-evolving element, substantially as set forth. 6. The combinationof a ray-tube having anode and cathode terminals, and a compoundterminal arranged therein and comprising ashell. of gas-absorbingmaterial and a mass of gas-evolving material inclosed in said shell,substantially as set forth.

7. The combination of a ray-tube having anode and cathode terminals, acom pound terminal arranged therein and comprising a gas absorbing and agas-evolving element, and an external electrical connecting means common.to both of said elements, substantially as set forth. I

8. The combination of a ray-tube having anode and cathode terminals, acompound terminal arranged therein and comprising ashell ofgas-absorbing material and a mass of gas evolving material inclosed insaid shell, and an external electrical connecting means cornmon to bothof said gas-absorbing and gasprodueing materials, substantially as setforth. Signed at Chicago, Illinois, this 6th day of September, 1904:.

. ROBERT FRIEDLANDER. Witnesses:

ROBERT BURNS, M. H. HOLMES.

